Migrate LocalStorage

This plugin can be used in conjunction with cordova-plugin-wkwebview-engine to persist LocalStorage data and indexed db when migrating from UIWebView to WKWebView. All related files will be copied over automatically during startup so the user can simply pick up where they left of.

How to use

Simply add the plugin to your cordova project via the cli:

cordoa plugin add cordova-plugin-migrate-localstorage

Notes

LocalStorage or indexed db files are only copied over once and only if no LocalStorage or indexed db data exists for WKWebView yet. This means that if you've run your app with WKWebView before this plugin will likely not work. To test if data is migrated over correctly:
1. Delete the app from your emulator or device
2. Remove the cordova-plugin-wkwebview-engine and cordova-plugin-migrate-localstorage plugins
3. Run your app and store some data in LocalStorage
4. Add both plugins back
5. Run your app again. Your data should still be there!
Once the data is copied over, it is not being synced back to UIWebView so any changes done in WKWebView will not persist should you ever move back to UIWebView. If you have a problem with this, let us know in the issues section!

Background

One of the drawbacks of migrating Cordova apps to WKWebView is that LocalStorage data does not persist between the two. Unfortunately, cordova-plugin-wkwebview-engine does not offer a solution for this out of the box (see https://issues.apache.org/jira/browse/CB-11974?jql=project%20%3D%20CB%20AND%20labels%20%3D%20wkwebview-known-issues).

License

mattiasclaesson/cordova-plugin-migrate-localstorage

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